Use USB-C power brick at your own risk
I have a 130W USB-C power supply I use to charge my drone batteries.(I've measured the output and know it can deliver nearly the advertised power.) Because it's so much lighter than the Asus brick, I thought I'd try it on my G605MY (G16) to make travel lighter. Now I no longer have a 4090 GPU. Although I was not gaming or doing anything with heavy GPU loads, the spikes during booting or even casual use can cause conditions that will blow out the MOSFETs that supply the power rails to the GPU. Running GPU-Z shows 0 memory, indicating either failed MOSFETs or failed VRAM. This is an out-of-warranty unit, so sending it to ASUS for repair (almost certainly a motherboard replacement) makes a new machine look competitive.
Even a warranty might not cover it if you admit to using the USB-C power supply, since the manual says to use only the original power supply. Of course, that conflicts with the section that says the USB-C port supports power delivery, though at perhaps lower performance and reliability.
Bottom line - like the title says - use at your own risk.
